Hello. So I have some good news and some bad news. NOTE my BYD Seal's software version is (I think) the one BEFORE the update, which introduced the BYD app store and digital onboard Instruction Manual.
The great news is that the method by naming the folder 'SilentInstaller' works automatically as you can see in the photos below, a quick google translate shows that the green is successfully installed and the red is failed. I believe the red are just cache files picked up by the system so they are not meant to be installed anyway?
By simply exiting that page, I found all the APKs I had in that folder installed.
Google Maps works to search for things (ie internet access works), however it doesn't seem to get the location.
SO, even by allowing all permissions for Google Maps, PlugShare, Netflix or YouTube, I was given errors, which I think are to do primarily with Google Services.
The above pic shows the Netflix error. A quick search shows that this has to do with potential corrupted cache data? https://forums.tomsguide.com/faq/device-failure-occurred-501-1006-netflix-error.190051/ Apart from switching the car off and on I didn't reset the system by holding the volume button as you do when installing the official BYD dashcam. Perhaps this can solve all the issues? I will try this later and update again.
I don't have a screenshot of YouTube, because it only opens for a second with a popup saying something to do with Google Play services, which I think is the same as the PlugShare Error above.
The 1 app that works flawlessly is Pocket Casts, which is my podcast app of choice. I could sign in, all my subscribed podcasts loaded and it works great.
IN SUMMARY (I think), the installation method works to install all the apps, however, I believe some apps have their own security checks, which may limit their operation? If anyone has any insight on this please let me/us know!